Guillotine cut-off mechanism for sewing machines



Sept. 1, 1964 H. R. GEORGE ETAL GUILLOTINEI CUT-OFF MECHANISM FOR SEWING MACHINES Filed April 26, 1961 FIG-/ 3 Sheets-Sheet 1 FIG 3 INVENTOR.

p 1, 1964 H. R. GEORGE- ETAL 3,146,742

GUILLOTINE CUT-OFF MECHANISM FOR SEWING MACHINES Filed April 26, 1961 5 Sheets-Sheet 2 Sept? 1, 1954 HR. GEORGE ETAL 3,146,742

GUILLOTINECUT-OFF MECHANISM FOR SEWING MACHINES Filed April 26, 1961 5 Sheets-Sheet 3 FIG-8 FIG-7 FIG-9 INVENTOR. NW Q 8 BY hm ,6. 74420.

United States Patent 3,146,742 GUILLOTINE CUT-OFF MECHANISM FOR SEWING MACHINES Hayden R. George, 181 Carnation Ave, and Norman B.

Fisher, 14 Grchard Lane, both of Uniontown, Pa.

Filed Apr. 26, 1961, Ser. No. 105,603 1 Claim. (Cl. 112-130) This invention relates to new and useful improvements in cut-off mechanism for sewing machines and it is among the objects thereof to provide cut-off mechanism that is adapted to any style of sewing machine and readily mounted thereon.

It is a further object of the invention to provide a cutoff mechanism for sewing machines employing a guillotine type knife that cooperates with the throat plate to sever the elastic, piping, cord or tape that is being sewed on an article such as garments, bras, etc., the cut-off mechanism being actuated by a solenoid energized by a switch.

The invention will become more apparent from a consideration of the accompanying drawings constituting a part hereof in which like reference characters designate like parts and in which:

FIGURE 1 is a side elevational view of a sewing machine with a cut-off mechanism embodying the principles of this invention attached thereto;

FIGURE 2 an end elevational view thereof;

FIGURE 3 is a top plan view of a throat plate;

FIGURE 4 a side elevational view of the cut-off mechanism;

FIGURE 5 a front elevational View of the cut-off mechanism with the end wall partially cut away;

FIGURE 6 a cross-sectional view taken along the line 6-6, FIGURE 4;

FIGURE 7 a cross-sectional view taken along the line 7-7, FIGURE 4;

FIGURE 8 a cross-sectional view, partially in elevation, taken along the line 8-8, FIGURE 4; and

FIGURE 9 a cross-sectional view taken along the line 9-9, FIGURE 4.

With reference to FIGURES 1 and 2 of the drawing, the numeral 1 designates a sewing machine table mounted on a stand, not shown, to which the sewing machine designated by the numeral 2, is attached. A presser foot 3 bears down on the fabric material 4 that is being sewed as it passes over the table 1. Attached to the machine 2 is a cut-off mechanism generally designated by the numeral 5, which consists of a housing that is attached to the sewing machine 2 by means of bolts and nuts 6 and 7, the housing being provided with a cover 8 that is secured thereto by a screw 9.

Depending from the housing 5 is a guillotine type knife 10 that is attached to a bracket 11 which is secured to a slide 12 that is operative in a vertical guide 13, FIGURE 4. The knife blade 10 extends through a slot 14 in a throat plate 15 that is mounted on the machine table and over which the material to be sewed passes. The guillotine knife is actuated by a lever 16, FIGURE 4, that is pivotally mounted at 17 and has sliding connection with a pin 18, as shown in FIGURE 6. Lever 16 is connected by a link 19 to a bell crank lever 20 that is pivoted at 21, the bell crank lever being biased by a spring 22 to hold the knife 10 in the normally retracted position. One arm of bell crank lever 20 is provided with a link 23 that is connected to the armature 24 of a solenoid 25 having electrical connections 26 and 27 with a source of power, a switch being provided to energize the solenoid 25 when it is desired to actuate the cut-off mechanism. Such a switch, not shown, may be located to be operable by the knee or arm of the machine operator in a conventional manner. The actuating mechanism is shown in detail in FIGURES 5, 6, 7, 8 and 9 of the drawing. FIGURE 9 "ice shows that the bell crank lever 28 is mounted in a bifurcated arm of the link 23 and the end of the actuating slide 24 is disposed in a bifurcated portion of the link 23 to allow freedom of movement of the operating parts. The slide 12 with the guide 13 is also more clearly shown in FIGURE 8 of the drawing in which the connection of the lever 16 through the pin 18 is also disclosed.

FIGURE 7 shows the flange plate 26a with the holes 27a for receiving the bolts 6 for mounting on the machine proper, and FIGURE 5 shows the detail of the spring 22 mounted on the bifurcated rod 28 that is pivoted to the bell crank lever at 29, the other end of the pin being secured by a bracket 38 to the housing wall 31 by screw 32, FIGURE 5. The link 19 is shown in FIGURE 5 as provided with pivot pins 33 and 34 for fastening the bell crank lever 20 and the lever 16, respectively.

It is evident from the foregoing description of the invention that cut-01f mechanisms for sewing machines as described therein, may be used effectively where elastic, piping, cord or tape is sewed on bras and other wearing apparel by simply energizing an electric circuit which eliminates the need of an additional person known as a cut-oft girl, for severing these materials, as has been customary in the past. It is apparent that the cut-01f mechanism may be provided with adaptors for receiving and mounting cut-01f knives of various widths and shapes and the throat or cloth plate may be provided with varying widths of slots or instead of a slot, the knife may be brought to rest on the yielding surface of a plate for severing. Such a plate may be wood or plastic, leather or other materials that would permit severing without injuring the cutoff blade.

Although one embodiment of the invention has been herein illustrated and described, it will be evident to those skilled in the art that several modifications may be made in the details of construction without departing from the principles herein set forth.

I claim:

A cut-off mechanism for sewing machines comprising a housing having a guillotine blade extending therefrom attached to the sewing machine frame to one side of the presser foot and in alignment therewith to act upon the material passing under the presser foot after it has been sewn, an operating mechanism in said housing and a guide for the guillotine blade, said blade having a shank disposed in said guide, a lever pivoted in said housing and having a pivotal connection with said shank to reciprocate said shank in said guide, said lever being connected to a bell crank having one leg thereof attached to a spring to be normally biased to maintain the guillotine blade in its raised position and the other leg of said bell crank having a link connected to the operating mechanism whereby when the latter is energized it will actuate the bell crank lever to operate the said guillotine blade, said lever connecting said blade to the bell crank having a slotted connection with a flanged pin secured to said guillotine blade shank.

References Cited in the file of this patent UNITED STATES PATENTS 303,818 Cummings Aug. 19, 1881 564,818 Batchelor July 28, 1896 1,592,115 Lindgreen July 13, 1926 2,262,294 Merrifield Nov. 11, 1941 2,711,703 Duby June 28, 1955 2,736,282 Bierman et al. Feb. 28, 1961 OTHER REFERENCES Reeber et al., German printed application, Sept. 10, 1959 (K1 52a 38/01). 

